Undiscoverable Alt

I have read the tutorial - so if I use hydrastorm to hide my MAC and other stuff and clear cache after getting banned, my other accounts won't be affected then? For example if lindens see that i use same IP for alt and for main account they won't ban my main account also? Or i always have to connect to SL through Tor while using alt? I ask because i don't want to get my main account banned at any cost while i would like to copy stuff :)